der Ort
place / location
A specific spot, a particular place, or a point in a space.
Markiere den Ort auf der Karte, an dem du den Schatz versteckt hast.
Mark the place on the map where you hid the treasure.

place / town
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place / location
A specific spot, a particular place, or a point in a space.
Markiere den Ort auf der Karte, an dem du den Schatz versteckt hast.
Mark the place on the map where you hid the treasure.

The word 'Ort' (place) is a very productive component of compound nouns. The suffix '-ort' always refers to a place connected with the first part of the word.
Bitte geben Sie Ihren Wohnort und Ihren Geburtsort an.
Please provide your place of residence and your place of birth.
The preposition depends on the meaning. 'An einem Ort' (at a place) describes a specific spot (m01). 'In einem Ort' (in a town/village) means that you are within a locality (m02).
Wir trafen uns an einem geheimen Ort im Wald.
We met at a secret place in the forest.
Whether 'Ort' means a spot (m01) or a locality (m02) is revealed by the context. Adjectives like 'klein' (small) or 'bekannt' (well-known) point to a locality. Genitive attributes like 'des Treffens' (of the meeting) point to a specific place.
Wir treffen uns am vereinbarten Ort.
We'll meet at the agreed place.
The expression 'vor Ort' (on site) means that someone or something is directly at the relevant place. It is often used to express that no travel or transport is necessary.
Ein Techniker kommt vorbei, um das Problem vor Ort zu lösen.
A technician will come by to solve the problem on site.
The expression 'an Ort und Stelle' (then and there / on the spot) means 'immediately and exactly in this place.' It emphasizes that something happens without delay and without changing location.
Die Polizei war schnell da und befragte die Zeugen an Ort und Stelle.
The police arrived quickly and questioned the witnesses on the spot.
city
'die Stadt' and 'der Ort' can both refer to an inhabited settlement. 'Stadt' is more precise when talking about a larger settlement with many houses, streets, shops, and often its own administration. 'Ort' is more general and can be a village, a small town, or a municipality. Learners may confuse the words because in everyday language people sometimes ask: 'In welchem Ort wohnst du?' (What town/place do you live in?). In that case, a city can also be an 'Ort'. But if you want to clearly say that something is not a small rural settlement, 'Stadt' is the better choice.

Der Ort liegt ruhig am See und hat nur wenige Geschäfte.
The town is quietly located by the lake and has only a few shops.
Meine Schwester wohnt in einer großen Stadt mit vielen Museen.
My sister lives in a large city with many museums.